Heavy Ion Physics at RHIC: RUN14-16 Overview
Exploring heavy ion physics at RHIC through the RUN14-16 campaigns, focusing on measuring heavy quarks like charm and bottom, the experimental setups, beam energies, and the significance of probing Quark Gluon Plasma using heavy quarks. Detailed information about the runs, detectors used, and the main objectives of each run is provided in this comprehensive overview.
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Heavy Ion Physics in RUN14-16 Japan Korea PHENIX meeting Nov. 27, 2014 Y. Akiba
RHIC Runs (2014-2016) RUN14 (completed) Au+Au at 14.6 GeV (complete Beam Energy Scan) Au+Au at 200 GeV (Main part of the run) He3+Au at 200 GeV (QGP in small system) RUN15 (Jan June 2015) p+p at 200 GeV (transverse spin) p+Au at 200 GeV p+Al at 200 GeV RUN16 Au+Au at 200GeV 10 weeks To Be Determined 510GeV pp or 62 GeV AuAu
Heavy Quark Campaign in RUN14-16 Main purpose of RHIC run in 2014-16 is to measure heavy quarks (charm and bottom) PHENIX has silicon vertex tracker VTX and FVTX. Charm and botton decays are identified by precision vertex measurement by these detectors. STAR also has HFT (Heavy Flavor tracker) from RUN14 RHIC runs with VTX RUN11 Au+Au @200 GeV RUN12 p+p @200/510 GeV (1strun with FVTX) Cu+Au @ 200 GeV RUN14 1stMain Heavy Flavor run. Au+Au@200 GeV; ~20 times of RUN11 data RUN15 p+p: baseline p+A: Cold nuclear Matter effects RUN16 2ndMain Heavy Flavor run (1strun with VTX)
Heavy Quark (charm, bottom) Quarks u c t charm ~170 GeV up ~2MeV ~1.3GeV top d s b 4.2GeV strange down ~5MeV ~0.1GeV bottom (mass of proton ~ 0.94 GeV) Protons and neutrons are made of u and d quarks (+gluons, etc) u, d, s quarks are light and can be made in later stage of nuclear reaction c, b quarks are heavy (mc, mb> QCD) They can only be produced at hard collisions at the initial stage Their production rate can be calculated by pQCD Very useful probe for both of Quark Gluon Plasma and nucleon structure
Probing Quark Gluon Plasma with heavy quarks PHENIX measured heavy quark production in Au+Au collisions via single electrons from heavy flavor decays PRL98, 172301 RAA of b,c e v2of b,c e Strong suppression of electron from heavy flavor decay is observed Large energy loss of heavy quark in QGP Large elliptic flow strength v2 of single electrons from heavy flavor decay is observed Heavy quark flows in QGP medium In these previous measurements, b e and c e were not separated Measure b e and c e separately
VTX Barrel BEAM VIEW SIDE VIEW beam 6
RUN14: heavy Quark run DCA resolution in RUN14 data recorded luminosity in VTX acceptance 2.3/nb or 14.3 Billion Au+Au events recorded within |z|<10cm (good VTX acceptance) Total # of events recorded > 17 Billon DCA resolution 80 m for pT>1 GeV achieved in RUN14. Will be improved by further refinement of alignment/calibraiton
VTX analysis status We are finalizing the data analysis of RUN11 Au+Au, the first run of VTX About 2B Au+Au events within VTX acceptance All tools for event analysis have been developed Calibration Alignment DC-VTX track reconstruction Decomposition of DCA (Distance to Closest Approach) distribution to separate b e and c e Paper of the final result early in the next year All analysis tools are available for RUN12 and RUN14 data analysis RUN12: Cu+Au@200 GeV 2.9/nb (36/pb N+N) RUN14: > 17 B events with ~2 times of effective acceptance Effectivey, ~20 times of RUN11 data
RUN11 DCA resolution DCA resolution better than 80 micron for pT> 1GeV/c 60 micron for pT > 3GeV/c D0c = 123 micron B0c = 455 micron
RUN11 DCA distributions DCA distributions are well reproduced by sum of b->e, c e and background componets We can measure b e and c e separately
Run11 DCA distribution 0.015<|DCA|<0.06 is dominantly c e and b e with small background c e and b e yield can be extracted from the DCA distribution Very sophisticated fitting/decompositi on code of DCA & pT distribution has been developed
Analysis Topics from RUN14 data RAAof b e and c e v2and v3of b e and c e Direct reconstruction of charmed hadrons D0 K and other modes D+ K and other modes Ds KK , KK0and other modes D* -> D c-> pK0, pK and other modes B J/Psi + X
Analysis topics in RUN14 (cont.) v2and v3of charged hadrons in wide pT and eta range High pt charged hadron pT distribution Correlation of central arm track and VTX standalone tracks Hadron hadron correlation e (HF) hadron correlation photon/pi0 hadorn correlation Dark Photon search Thermal direct photon (pT<3 GeV/c) measurement via internal and external conversion Thermal di-electron pair (1<Mee<3 GeV) from QGP
B J/Psi measurement High pT hadrons and correlations (J/ ) e Secondary vertex RUN11 data e B X L Lxy Prim Vtx dca B can be measured as displaced J/Psi (B J/Psi) Expected yield: ~500 displaced J/Psi in RUN14 data With VTX, high pT background is strongly suppressed; pT range extended beyond 20 GeV/c Various correlation between high pT tracks in DC and VTX standalone tracks
1<mee<3 GeV is the window to detect thermal di-electrons from QGP Charm background is suppressed by DCA measurement This measurement is possible in high statistics data of RUN14 G-2 band is basically excluded by the present data Long lived dark photon with small mixing and small mass can be searched in RUN14 data
RUN15 RHIC plan for RUN15 9 weeks of polarized p+p at 200 GeV Transverse spin measurement Baseline of charm/bottom production Photon/pi0 vias new MPC-EX at forward rapidity 5 weeks of p+Au at 200 GeV Flow (v2, v3) in p+Au Cold Nuclear Matter effects in c/b production 2 weeks of p+Al at 200 GeV QGP in small system
Analysis Topics in RUN15 ANof charm production c e and b e in p+p (baseline for Au+Au) c e and b e in p+A (CNM effects) D-meson measurements in p+p D meason measurements in p+Au, p+Al Flow in p+Au/p+Al Photon/pi0 measurement at forward rapidity with MPC-EX Transverse spin with MPC-EX
Summary RUN14-RUN16 is heavy flavor campaign of RHIC Au+Au in RUN14 and RUN16 p+p/p+A in RUN15 Good progress in VTX analysis RUN11 results will be finalized soon Ready to analyze large dataset in RUN14 RUN14 is a big success. Large (>17B) Au+Au events are recorded DST production will start soon Many analysis topics
